Permutation-lock



(ModeL) W. W. SWETT.

PERMUTATION LOCK.

No. 269,137. Patented Dec.1 2, 188-2.

WITNESSES INYENTOR:

ATTORNEYS.

PETERS. FholwLilhcgnplnr. wnhm mn. D4

I UNITED STATES PATENT @rtrcn.

WILBRA w. swnrr; OF SPRINGFIELD, ILLINOIS.

PERMUTATION-LOCK.

SPEOIFTCATION forming part of Letters Patent No. 269,137, dated December 12, 1882.. Application filed April 25, 1882. (ModeL) State of Illinois, have invented a new and Improved Permutation-Lock; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being bad tothe accompanying drawings, forming part of this specification, in Which- Figure 1 is a rear view of my improved look as applied to a safe-door, with the plate removed. Fig. 2 is a horizontal section on line .10 90, Fig. 1. Figs. 3 and 4 are detail views.

This invention relates to that class of locks which are known as combination and permutation locks; and it consists mainly in such an adaptation and arrangement of parts as to render the lock capable of being operated by the sense of feeling instead of the sense of sight. 1

it consists, further, in certain details of construction which, in connection with the foregoing, will be fully described hereinafter.

In the drawings, A represents the door of a safe or other case or box to which the lock is applied, which is provided with a recess adapted to receive the look, as shown, which recess, being a portion of a true circle, may be readily made by a bit or other boring-tool.

B represents the case of the lock, which is provided upon its straight side \vitha proper opening for the projection of the bolt, and also upon its interior with a stop-block, b, and a central hollow stud, b, as shown.

0 represents the bolt, consisting of a plate of proper size and shape, having at one end a rectangular portion, '0, adapted to project from the lock to engage with the keeper, and at the other a tapering portion, 0, having a central slot, 0 adapted to permit the bolt-plate to have its proper movement withoutinterference with the central stud, b. V

D represents a locking-arm pivoted upon the bolt-plate, which is provided with the broad head d, having the projecting tooth d, as shown.

E represents a spring, which is adapted to actuate the locking-arm at the proper time, as will be fully described hereinafter.

F represents a tumbler-disk located on the central stud, b, which is provided with the notch f and adjustablepin f, as shown.

G represents a-turnbler-disk' located on the central stud, b, which is provided with the notchg and the pins shown.

H represents a tumbler-disk having the central shaft, is, adapted to extend through the hollow stud b, which is provided with a notch, h, an adjustable pin, 7L2, upon its inner face, and a series of radial grooves, k upon its outer face, as shown. if represents a knobhandle which is rigidly secured to the shaft h, upon the outside of the door, in any proper manner. Suitable washers are interposed between-the tumbler-disks and the bearing-surfaces with which they come in contact.

1 represents a flat spring extending across outer face of the disk H, and secured at its ends to the case, which is provided with a de tent or tooth, i, adapted to engage with the radial grooves h as shown. In the arrangement shown two of the radial grooves are arranged close together and the others of the series farther apart. The two grooves lying together furnish a base-point from which the. necessary deductions may be made. When the bolt is in its projected position the end of the spring locking-bar D lies in front of the stop-block b of the case, it being held in this position by the uncut portions of the peripheries of the tumbler-disks bearing against the tooth d of the locking-bar, as shown.

The operation is substantially as follows: The knob-handle. after having been turned to the right several times in order to bring the tumbler-disks into the proper relation to each other, is moved to the base-point-that is, in such manner as to bring the double groove of the disk B into contact with the detent of the spring I. Having found the base-point by feeling the click as it snaps into the grooves, the grooves are counted in alternate directions until each tumbler in its turn, beginning with the inner one, is brought into the proper position for unlocking. The end of the lockingbar being thus disengaged from the stop-block, the bolt may be moved into the case to unlock the door.

By a proper arrangement of the pins any desired combination may be obtained in the manner well understood.

The special advantage of this peculiar construction is that the proper movements to ung 9 one on each side, as

lock the door are obtained through the sense i the disk H, having grooves ligand a detentto' of feeling instead of the sense of sight, the spring, I, witha handle-or knob, W, for the engagement of the detent of the spring I with purpose of arranging the position of the tumeach groove furnishing a positive indication of bier-disks by feeling said detent snap into said aprecise point,thus preventingthe probability grooves, as shown and described.

of revolving the'disks too far. WILBRA WENTWORTH SWETT.

Having thus described my invention, what Witnesses:

I claim as new is THOMAS STIRLING,

In a permutation-lock, the combination ofl THOMAS F. BROWN. 

